Boeing, whose shares closed down 5.3 percent at $400.01 in the heaviest trading trade since July 2013.

The new MAX 8 variant of the 737, the world's best-selling modern passenger aircraft, has bigger engines created to use less fuel.

On Monday, Transportation Secretary Elaine Chao said the department had sent investigators to Ethiopia and would act if it had information about a threat to the public. The company added, however, that it recommended to the FAA that all 737 Max planes be temporarily grounded around the world.

Many countries, including the United Kingdom, have suspended the plane after Sunday'scrash.

He said the company was using alternative airlines including SAS, AirFrance and KLM to rebook and that he believed customers would come back to Norwegian Air if they reopened flights on the MAX in the future.

The plane crash was the second fatal incident involving the same model in five months.

Meanwhile, passengers in the US are taking to social media to express their displeasure about potentially flying on Boeing 737 Max planes.

However, the tilting problem did not appear related to the new automatic anti-stall system that's suspected of contributing to the deadly Indonesia crash on that aircraft model in October. He said that in the case of the Lion Air crash off Indonesia, the pilot fought against computer software that wanted to drop the nose of the plane. Air Canada has 24 Max 8 aircraft (out of 184 in its main fleet), which it uses mainly for domestic and USA routes, while Calgary-based WestJet Airlines Ltd. has 13 Max 8s (out of about 150 planes).

Numerous passengers were heading to a United Nation's environmental conference in Nairobi.

So far, Southwest has the largest Max fleet with 34 aircraft, while American has 24.

One elderly couple collapsed into each other's arms after strewing flowers in front of a picture of a smiling young woman, while a family propped each other up, tears coursing down their faces. It automatically pushed the nose down, officials said, and pilots could not recover.

Other carriers, including China have grounded the B737 MAX 800 aircraft in their fleets due to safety concerns.

Passengers were fretting too, with many seeking reassurances they would not be flying on a 737 MAX. He said he hopes the planes will be flying safely within weeks.

"We fully support this decision and will continue to work with Transport Canada towards resolution of this situation as soon as possible", the Montreal-based airline said.

Democratic Senator Richard Blumenthal suggested on Twitter that an upcoming hearing on the crash would focus on that conversation.

Boeing dropped as much as 3.2 per cent after Trump's announcement but recovered much of the days loss by 3:17 p.m.in NY.

Norwegian Air said it would seek recompense for lost revenue and extra costs after grounding its 737 MAX aircraft.

The senator added that despite the FAA's indications that software updates are likely coming, any such changes should be made before any more flights occur on the aircraft.

On Sunday an Ethiopian Airlines Max 8 crashed shortly after take-off killing all 157 on board.

This is a temporary suspension while we wait for more information to review the safety risks of continued operations of the Boeing 737 MAX to and from Australia.

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